fwiw, it takes a lot higher than 13Dkh to burn corals, I maintained my alk at 13.2 for about 2 years. I found colors were more vibrant and growth was accelerated. if the alk fell below 11, I would know from the look of the digitata as its color would dull a little.
now it is good to see people trying to quote NSW alk levels but realy who cares
, what good is quoting NSW levels if you don't follow them all. a Ca level of 450 is definatly not a NSW level, Mg of 1400 is close but a little high for the average, but hey, I like a elavated Mg also.
my best growth and color was at 82 degrees, 380-400 Ca, 13.2 DKH Alk, 1350 Mg, 7.9 Ph, zero nitrate/nitrite/amon/phosphate and any others I can't think of right now. I used AB10K 250watt SE bulbs run by M80 ballasts, on home made reflectors.
Steve
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